The Infinite Gift: How Children Learn and Unlearn the Languages of the World

Charles Yang, The Infinite Gift: How Children Learn and Unlearn the Languages of the World (New York: Scribner, 2006).

Drawing on cutting-edge developments in biology, neurology, psychology,
and linguistics, Charles Yang's The Infinite Gift takes us inside the
astonishingly complex but largely subconscious process by which children
learn to talk and to understand the spoken word. Yang also puts forth
an exciting new theory that we learn our native languages in part by
unlearning the grammars of all the rest.